光伏系统变步长扰动观测法MPPT算法研究
首发时间:2011-01-25
摘要:光伏电池阵列输出功率受光照强度和温度变化的影响,因此最大功率点跟踪(MPPT)技术广泛应用于光伏系统中。在所有最大功率点(MPP)控制策略中,扰动观察(P&O)MPPT算法因易实现被广泛应用,然而它的缺点是在稳定工作状态下工作点通过MPP时会导致能量振荡损耗,并且在光照强度或温度发生突变时表现较差的动态响应。在本文中,提出一种改进型变步长扰动观察MPPT算法,此方法依据工作点动态调整步长变化,与传统固定步长方法比较,本文提出的方法能有效地提高MPPT速度和转换效率,通过仿真和实验结果分析,验证了此改进算法的可行性。
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Research on Variable Step Size P&O MPPT Algorithm for PV Systems
Abstract: Maximum power point tracking (MPPT) techniques are employed in photovoltaic (PV) systems to maximum the PV array output power which depends on solar irradiance and temperature. Among all the MPPT strategies,The P&O Maximum Power Point Tracking algorithm is mostly used, due to its ease of implementation. However, its main drawbacks are the waste of energy in steady conditions, when the working point moves across the MPP and the poor dynamic performances exhibited when a step change in solar irradiance or in temperature occurs. In this paper, a modified variable step size P&O MPPT algorithm is proposed, the step size is automatically tuned according to the operating point. Compared with the conventional fixed step size method, the proposed approach can effectively improve the MPPT speed and efficiency simultaneously. A theoretical analysis and the design principle of the proposed algorithm are provided and its feasibility is also verified by simulation and experimental results.
Keywords: Maximum power point tracking (MPPT) the Perturb and Observe (P&O) Variable Step Size
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